Samsung S20 Not Registered on Network (Please help) - Device Repair

Hi Everyone
I purchased a second hand s20 6 months ago and i am no longer getting any network carrier coverage.
I took my phone to local mobile repair shop and they identified that my base software was South Korean for some reason so they factory reinstalled Android 12 with UK Software. (This still does not work and they are stuck trying to solve the problem)
I'm fairly certain that this issue started when i upgraded from Android 11 to 12.
Please can anyone suggest a possible solution for my phone problem?
Things i have done so far:
1.) Factory reset phone several times including separate network resets.
2.) Tested my new replacement Virgin sim card in 2 other phones (This works)
3.) Tried several working sim cards in my s20 phone (None worked)
4.) Confirmed my phone is not barred or locked.
5.) Checked that i can see other Mobile network operators (Does not connect when i select my provider)
6.) Tested in other cities to confirm it's not a signal coverage issue.
7.) And finally, my phone has the latest Android 12 updates inc local app updates
Thank you

Just to add a further update, i have managed to get my phone working intermittently through WIFI but i still have an issue when outside my home.

LK2022 said:
Hi Everyone
I purchased a second hand s20 6 months ago and i am no longer getting any network carrier coverage.
I took my phone to local mobile repair shop and they identified that my base software was South Korean for some reason so they factory reinstalled Android 12 with UK Software. (This still does not work and they are stuck trying to solve the problem)
I'm fairly certain that this issue started when i upgraded from Android 11 to 12.
Please can anyone suggest a possible solution for my phone problem?
Things i have done so far:
1.) Factory reset phone several times including separate network resets.
2.) Tested my new replacement Virgin sim card in 2 other phones (This works)
3.) Tried several working sim cards in my s20 phone (None worked)
4.) Confirmed my phone is not barred or locked.
5.) Checked that i can see other Mobile network operators (Does not connect when i select my provider)
6.) Tested in other cities to confirm it's not a signal coverage issue.
7.) And finally, my phone has the latest Android 12 updates inc local app updates
Thank you
Click to expand...
Click to collapse
Your phone can be in the blacklist as some unpaid fees in the contract of origin provider you purchased this phone. I had exactly same problems and after pay all over due bills phone went into normal.

My S20 Ultra LTE keeps detecting a ghost SIM in the second SIM slot and is making my phone lost signal. Is there a way I can convert it from dual SIM to single SIM?

Related

Sim Card Missing / Fried Sim

Okey so ive had my diamond for 3 weeks and have had this issue. The device worked fine for 2 weeks except for this problem that it keeps dropping the connection and just says "no service" but when i disable and re-enable the phone radio i get full signal. However one time the device froze and i had to soft reset. After which it said the "sim card is missing, you can make emergency calls if your service provider supports it" when the sim card was in the phone. I tried resets and cleaning the sim all to no avail. So after not being able to find anyone else with this problem i figured it must be my old 2g sim that had been causing the problems so i went and purchased a new 3g sim from my service provider (mobilezone [switzerland]) and inserted it into the device. Everything starts working again and i figure the problem is fixed. However the phone continues to drop the signal again and again over the next few days and finally kills the sim card again, and displays the same "sim missing..." error. So i have now taken it back to the retailer and they say there seems to be no issue with the device as the technichen inserts a new sim and everything works fine. The thing is that the sim cards are completely broken. They no longer work in any device!!! But it took 2 weeks the first time and 3 days the second, so the technicians agreed to test the device for a couple days, im just sure its gna work fine for that amount of time but screw up again after when i use it again. Can anyone provide any insight into this? I speculate that its perhaps an issue with my service provider since they do not have their own network but use orange (switzerland) with their custom network settings, and when configuring the device the WM6 connection wizard only has 3 options and my provider is not listed, so i use the orange config settings, which i thought may be slightly different and cause problems. Ideas?!?!?
Thanks in advance.
Sam
Please, distribute some of these across your text: ,,,,,,,,,,,,,,,,,,,,,,¶¶¶¶¶¶¶¶¶¶¶
If it helps, I had to have a new sim to use it in my new phone (not the diamond, a nokia) because it didn't work properly, as it was a relatively old sim.
Hi did you ever get your sim problem sorted, have been experiencing same,
except my sim still work on other phones?

Unlock issue with UK i9305 - won't work with Three (3) network sim!

I'll try and keep this breif but getting pretty frustrated with this...
I bought this handset sim free from T-Mobile UK. It was brand new and sealed. When inserting my Three(3) sim it would say "invalid sim" - which was expected as it was locked to T-Mobile. I paid a third party UK company called mobileunlocked.co.uk who have a very good reputation and lots of good reviews for an unlock code so I could use it with a Three (3) UK 3G Sim card. I received the unlock code and an un-freeze code and used both several times, resulting in "unsuccessful". Thinking it was a bad code, I paid ANOTHER unlocking company off ebay (again, reputable) and was supplied with the same codes and the same results but a slightly different method which involved entering * and # keys before the codes in the code box. This resulted in a popup saying "Network control code is blocked".
Following this, I tried the *#197328640# method to access the hidden menus as detailed in this thread http://forum.xda-developers.com/showthread.php?t=2014982 (this has been proven to work with Note II, Galaxy SIII and Galaxy SIII LTE).
I followed that guide to the letter and restarted the phone. At first, I had hope as there was no sim lock code entry box, however I waited and waited and waited and the phone did not pick up my Three (3) signal, despite it no longer saying "invalid sim".
Basically, it just shows several bars but does not pick a Three(3) signal or any date. I have tried manually selecting the network and manually entering APN settings, but I get the same result. When I try connecting manually it just says "Cannot register on network".
-I have tried using this sim card in other phones, it works OK!
-I have tried using other network sim cards (Orange, T-Mobile, EE, Vodafone) and they all work.
-I have tried using a different Three(3) sim in this phone and it still doesn't work.
I can't return it to the T-Mobile store as the warranty is invalid as I have unlocked it (or so I think!). Can anyone help? I know three(3) sims are compatible with this phone as others on this forum have stated they are using Three (3) sims in unlocked i9305s.
Any idea why my unlocking codes that were valid wouldn't work and why it said "Network control code is blocked"?
Any idea why my Three(3) micro sims won't work but other networks do despite this phone being compatible with three (3) sims?
Help!
It doesn't appear that 3 UK has any publicly available LTE network at this time, but that they are rolling one out. Perhaps it is physically available and being picked up by your phone, except 3 isn't allowing just any sim card to register on that network at this time? Try disabling LTE and attempting to connect again.
Rekoil said:
It doesn't appear that 3 UK has any publicly available LTE network at this time, but that they are rolling one out. Perhaps it is physically available and being picked up by your phone, except 3 isn't allowing just any sim card to register on that network at this time? Try disabling LTE and attempting to connect again.
Click to expand...
Click to collapse
I know I won't be able to get LTE as Three (3) aren't offering LTE until Q3. I am perfectly happy just using 3G. I have tried disabling LTE and using 3G only and the same things happen.
I have tried 2 different Three (3) micro sims in it and it still won't register on the network. I know Three(3) sims work in the i9305 as others have unlocked their's and used Three (3) sims.
It's either something wrong with the unlock, something wrong with the hardware or something isn't enabled/disabled. Like I said I've tried automatically connecting and manually entering APNs and still NOTHING.
Frustrating having spent over £450 on a brand new handset which I can't return as warranty is invalidated through "unlocking" (which hasn't unlocked it fully!)
bounce08 said:
I know I won't be able to get LTE as Three (3) aren't offering LTE until Q3. I am perfectly happy just using 3G. I have tried disabling LTE and using 3G only and the same things happen.
I have tried 2 different Three (3) micro sims in it and it still won't register on the network. I know Three(3) sims work in the i9305 as others have unlocked their's and used Three (3) sims.
It's either something wrong with the unlock, something wrong with the hardware or something isn't enabled/disabled. Like I said I've tried automatically connecting and manually entering APNs and still NOTHING.
Frustrating having spent over £450 on a brand new handset which I can't return as warranty is invalidated through "unlocking" (which hasn't unlocked it fully!)
Click to expand...
Click to collapse
Well you did purchase a phone which wasn't intended for use on your network, just saying
Rekoil said:
Well you did purchase a phone which wasn't intended for use on your network, just saying
Click to expand...
Click to collapse
Shouldn't be a problem to be honest. Have you tried calling three to say that you're using the i9305? I love three and their unlimited data plans I plan to do this once samsung/EE unlock my phone.
bounce08 said:
I'll try and keep this breif but getting pretty frustrated with this...
I bought this handset sim free from T-Mobile UK. It was brand new and sealed. When inserting my Three(3) sim it would say "invalid sim" - which was expected as it was locked to T-Mobile. I paid a third party UK company called mobileunlocked.co.uk who have a very good reputation and lots of good reviews for an unlock code so I could use it with a Three (3) UK 3G Sim card. I received the unlock code and an un-freeze code and used both several times, resulting in "unsuccessful". Thinking it was a bad code, I paid ANOTHER unlocking company off ebay (again, reputable) and was supplied with the same codes and the same results but a slightly different method which involved entering * and # keys before the codes in the code box. This resulted in a popup saying "Network control code is blocked".
Following this, I tried the *#197328640# method to access the hidden menus as detailed in this thread http://forum.xda-developers.com/showthread.php?t=2014982 (this has been proven to work with Note II, Galaxy SIII and Galaxy SIII LTE).
I followed that guide to the letter and restarted the phone. At first, I had hope as there was no sim lock code entry box, however I waited and waited and waited and the phone did not pick up my Three (3) signal, despite it no longer saying "invalid sim".
Basically, it just shows several bars but does not pick a Three(3) signal or any date. I have tried manually selecting the network and manually entering APN settings, but I get the same result. When I try connecting manually it just says "Cannot register on network".
-I have tried using this sim card in other phones, it works OK!
-I have tried using other network sim cards (Orange, T-Mobile, EE, Vodafone) and they all work.
-I have tried using a different Three(3) sim in this phone and it still doesn't work.
I can't return it to the T-Mobile store as the warranty is invalid as I have unlocked it (or so I think!). Can anyone help? I know three(3) sims are compatible with this phone as others on this forum have stated they are using Three (3) sims in unlocked i9305s.
Any idea why my unlocking codes that were valid wouldn't work and why it said "Network control code is blocked"?
Any idea why my Three(3) micro sims won't work but other networks do despite this phone being compatible with three (3) sims?
Help!
Click to expand...
Click to collapse
Hi,
I am in the same boat, I actually got the S3 LTE from EE in December (GOT IT FOR 359).. Initially, it worked with three after unlocking via xda..*#197328640# method ..But it stopped working or it was working intermittently...
So tried rining three..they said..ohhh our network is best and our (three) sims will work only in three mobiles..
Anyway I tried all other methods..re-set..factory etc..
Finally sent the mobile to Samsung...
after 10days, I got it back...Now as soon as I insert three sim..it says invalid sim..So tried *#197328640# method again..unfortunately..i can't do that as (the last option INITIALIZE...) does not show up now..
Anyway managed to get unlock code from ebay...NO USE..it shows the same problem as yours.."network control is blocked"...
Donno what to do??? might ring samsung again tomorrow...
Have you tried speaking to T mobile about getting it unlocked????
If you find any answers..pls let me know
Thanks in advance
I'm having the same problem. Any updated on how things went with T-mobile or does anyone have a fix?
Should I cancel my order?!
I just bought the S3 LTE i9305. I purchased it as an upgrade and its arriving tomorrow. I wanted to give my sim to my mother and keep the phone to use with Three's DC-HSPA+ which will work on the S3 LTE. So can I unlock it or will it be facing the same problems as mentioned in the thread. Sorry for not helping out, ama noob and GOOD LUCK! :good:
I recently put in an unlocking request at EE. They get a samsung unlocking code directly from Samsung. So I'll give this method a go. I am getting my Sim Card in soon from three. Decided to jump the boat on to the one plan @ £25 a month. =) EE's london signal is pants. =(
Sent from my GT-I9305 using Tapatalk 2
bleepsake said:
I recently put in an unlocking request at EE. They get a samsung unlocking code directly from Samsung. So I'll give this method a go. I am getting my Sim Card in soon from three. Decided to jump the boat on to the one plan @ £25 a month. =) EE's london signal is pants. =(
Sent from my GT-I9305 using Tapatalk 2
Click to expand...
Click to collapse
I tried to get an unlock code from T-mobile, they said that Samsung wouldn't release it for another six months, since it's a new phone. Even though we've been with them for donkeys years!
Right today, I recieved my sim. I'm glad to say everything works. I'm getting around 8mbps down and 1mbps up in West London.
If yours doesnt work then it probably is a damaged sim.
Tell T-Mobile you want to speak to someone that knows what they are talking about. It takes up to 60 days for direct Samsung unlock code. You might have to pay a tenner but worth it jn my perspective. I'm glad I have unlimited data again. It feels like freedom. No Joke. o2 Used to do an unlimited tariff and I loved it. There reasoning was to improve their network but instead it made it worse. I know Three arent known for their calls but they certainly know what customers want and thats data.
PS how do I know if im getting the optimum speed?
Sent from my GT-I9305 using Tapatalk 2
Try this
http://forum.xda-developers.com/showthread.php?t=1335548
I think you have updated the software via OTA.. you need to downgrade to I9305XXALI5_I9305EVRALI5_I9305BVALI5 (this is for people who have got phone from T-mobile). Download from Sammobile.com, flash via odin (this wont affect ur warranty as this is stock firmware and doesnt increase the binary counter).
once you are sure that you have the above software, then follow the instructions on the below in first post in the mentioned link, again no rooting involved:
http://forum.xda-developers.com/showthread.php?t=2014982
People have confirmed that after unlocking via this method if you go ahead with OTA, you will still have the phone unlocked.
I have followed the above procedure but havent updated the firware and have not used the phone yet. But its unlocked and I have tried using Three UK sim, it works,
Do let me know how it goes.
kams19 said:
I think you have updated the software via OTA.. you need to downgrade to I9305XXALI5_I9305EVRALI5_I9305BVALI5 (this is for people who have got phone from T-mobile). Download from Sammobile.com, flash via odin (this wont affect ur warranty as this is stock firmware and doesnt increase the binary counter).
once you are sure that you have the above software, then follow the instructions on the below in first post in the mentioned link, again no rooting involved:
http://forum.xda-developers.com/showthread.php?t=2014982
People have confirmed that after unlocking via this method if you go ahead with OTA, you will still have the phone unlocked.
I have followed the above procedure but havent updated the firware and have not used the phone yet. But its unlocked and I have tried using Three UK sim, it works,
Do let me know how it goes.
Click to expand...
Click to collapse
On the site, it says it's for EE, is that still ok? I know T-mobile, Orange and EE, are all pretty much the same thing now, but I just want to be sure. I wouldn't want to put something that starts putting EE logos all over on boot up etc. The one that came with the phone doesn't mention anything about T-mobile on boot up.
It won't EE is unbranded
Thanks... I've zapped it with 4.1.1, used that trick, and then allowed the 4.1.2 update + plus another update of some sort through OTA, and I'm now using O2 happily! Cheers!
Phone arrived Friday on Orange EE with 4.1.2. wouldn't accept 3uk sim.
Tried the *#...640# trick but menu options not present.
Reverted firmware down to 4.1.1. Li5 Uk EE and voila menus present.
Tried 3uk sim and works fine.
Flashed latest Wanamlite rom and still unlocked on 3uk.
Getting a reliable 15.5 Mbs down on dc HSDPA at home despite only having 1 bar signal, on three One plan unlimited for £15/mth.
NGbod said:
Phone arrived Friday on Orange EE with 4.1.2. wouldn't accept 3uk sim.
Tried the *#...640# trick but menu options not present.
Reverted firmware down to 4.1.1. Li5 Uk EE and voila menus present.
Tried 3uk sim and works fine.
Flashed latest Wanamlite rom and still unlocked on 3uk.
Getting a reliable 15.5 Mbs down on dc HSDPA at home despite only having 1 bar signal, on three One plan unlimited for £15/mth.
Click to expand...
Click to collapse
Great news!

After Android 10 update no phone calls possible

Hi,
I got the update to android 10 yesterday and installed it. My provider is Vodafone DE.
After update, I'm not able to make any calls (or receive ones) anymore.
I already figured out, that this problems does not exists when I'm disable 4G and switch to 3G only.
I also tried out another carrier (Telekom DE), there the problem does not exists (VOLTE is activated).
I cleaned the cache of phone app and google play services. I also already resettet the network several times.
Any more suggestions what could be problem / how to make phone calls working with 4G enabled?
Hi,
I have exactly the same problem, after update to ANdroid 10 no phone calls with 2G or 4G via vodafone in Germany, SMS and (apparently most of the time?) mobile data works in all 2G/3G/4G; another SIM card from the german provider Telefonica/O2 (under the lable BLAU) works fine; the Vodafone SIM also works in my old mobile.
I noticed something else: in the SIM-card settings (where e.g. the color can be chosen for SIM 1 or 2), while under "Mobilfunkanbieter" for the BLAU-SIM card, there appears O2 -.de, vor the vodafone card, it sais "unbekannt"
Did you already find a solution?
I ordered a new Vodafone SIM, same problem; even resetting the whole device to factory mode didn´t help.
Probalb you are aware of a similar (yet apparently sifferent) problem with Nokia 8.1 in automn (I´m not supposed to post URLs here, you may prbably find it yourself in the vodafone forum, the thread there is in German)?

Sony XZ3 not connecting to network - help

I have a Sony XZ3 which was bought second hand 18 months ago. It's worked fine until about 1 month ago when it didn't get good signal or data anymore.
I am in the UK and use a giffgaff sim which runs on the o2 network. I found after some investigation that the phone for some reason was now connected to The Virgin network and I can't get it off.
Giffgaff have not been able to help, they said the phone is now locked to Virgin, Virgin said the phone is not locked but they did confirm that when it was bought new it was from them. Checking the handset it actually does say unlocked.
Have done a sim swap - the sim works fine, it's the phone that's the problem. It does the same with a different giffgaff sim in it.
Have reset network but it doesn't work and just defaults back to Virgin again. Have done factory reset 3 times but again just defaults back to Virgin every time. It says all other networks unavailable.
Can someone help please with what to do next?
Is there some kind of hard reset which will wipe everything including whatever is causing it to be switching to Virgin all the time? Or some way to override it?
It still shows no signal most of the time even though it says it's on Virgin
Thank you.
Hi everyone. I have the same problem. Since some weeks ago my phone doesn't recognize any network, not wifi or mobile and the it reset alone. I was told that it might be a software problem. I have already done factory reset and software repair from xperia companion but the problem persists.
I don't know if any of you knows if this is a hardware problem. But also I was trying to install a custom rom for android 11 to see if the problem is solved, but I can't unlock the bootloader either. I followed Sony official instructions to do this but for some reason Windows 10 doesn't recognize the phone after I turn it off and the press and hold the volume up button while connecting the phone to the PC with the usb cable. The drivers are installed but in the device manager it appears with a code 10 saying that the device might not be able to be recognize.
I have already checked if I can unlock the bootloader and it says yes.
Thank you very much.

Question X90 Pro Plus Network Issues?

Just wondering if anyone else might have had this issue I'm having and if there is any fix or work around for this. So I imported a Vivo X90 Pro Plus China variant and am currently using it in the US. I originally was using Verizon on it but was having network issues. Would work for a week or so (4G data,text,voice all worked), then would go to no bars and no service and would not re-connect with the network. I would have to remove the sim card, and re insert it multiple times or activate a new sim card and put it back into the phone for the phone to re connect and show signal bars and work again. So I assumed its just Verizon thus switched to a T-mobile sim and started using T-mobile with the device. With T-mobile worked better, got 5G instead of only 4G and everything was smooth for about 3 weeks. Then again I am having this same issue. Every week it drops service and says no service, I have to remove the sim card, insert a completely different sim and remove that sim and re insert my active sim for the phone to re establish and activate with the network.
SO the only thing I can think is that either the phone software somewhere is rejecting and blocking the sim or network after a while for some reason, or that the carrier (tmobile and verizon) are rejecting the phone being on their network and kicking it out. But if that is the case, why does it work again when I remove the sim, insert a different sim and re insert the same active sim back again. Makes me lean toward a software lock or something.
Any ideas? Thanks guys.
Im now in US too, currently running on mint and i didnt see any problems with network issues, most of time in on wifi but every time i need data it works fine. Only difference is im running european sim on slot 1 and us on slot 2.
oh, hmm not sure what could be causing this issue for me. I'm thinking maybe one of the installed Chinese apps are interfering with it but not sure.
I'm on mint as well (uses T-Mobile network).
Never had any network issues.
It might be worth trying to restore the phone and try the newer 2.6.4 debloat script as a baseline.
Then after that you can try removing some of the additional system packages like vivo store or vivo.pem (although the jury is mixed on whether it's useful to do that).
blabba said:
I'm on mint as well (uses T-Mobile network).
Never had any network issues.
It might be worth trying to restore the phone and try the newer 2.6.4 debloat script as a baseline.
Then after that you can try removing some of the additional system packages like vivo store or vivo.pem (although the jury is mixed on whether it's useful to do that).
Click to expand...
Click to collapse
I may have to try that and look into it. I'm not too familiar with doing any rooting or running adb stuff (been years since I did that sort of thing) so worried I might mess something up rather than fix it lol

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